Boat-propeller.



J. s. BLATZER @L P. J. PAWLosKI.

BOAT PROPELLER. APPLIOATION FILED APR.21, 1013.

1?@89939 1 Patented Mar. 10, 1914.

2 SHEETS-SHEET l.

WITNESS@ J. S. BLATZBR 6a P. J. PAWLOSKI.

- BOAT PROPBLLER.

APPLICATION FILED APR. 21. 191s.

Patented Mar. 10, 1914.

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.IosErH s. Bm'rznn. AND PHILIP J. PAwLosKI, or PONTIAC, MICHIGAN.

BOAT-PROPELLER'.

Specification of Letters Patent.

Application led April 21, 1918. Serial No. 762,699.

Patented Mar. 10,1914.

To all whom it may concern:

Be it known that we, JosnPH S. BLA'rzEn and PHILIP J. PAwLosKI, citizens of the United States, residing at Pontiac, county of Oakland, State of Michigan, have invented a certain new and useful Improvement in Boat-Propellers, and declare the following to be a full, clear, and exact description of the same, suoli as will enable others skilled in the art to which it pertains to make and use the same', reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to propulsion of boats and emergency stopping of boats by a powerful reverse propulsion. To stop the boat a plurality of side propellers .are brought into reversin operation at the sldes of the ship, so as to e ect a gradual but early stoppage of the boat in cases of emergency. These propellers may be also used to gradually slacken the speed of the boat in cases other than emergency when it is only desired to quickly control the boat. When said side propellers are used with the main propeller turning to propel the boat forward they increase the speed of the boat;

Tn the drawings: Figure l, is a horizontal, longitudinal section of the hull of the ship, showing some of the side propellers 1n position for operation and some withdrawn out of position for operation. This ligure is taken on the line B-@B of Fig. 2. Fig. 2, is a sect-ion onythe line A-A of Fig. 1.

a, represents the hull of the ship. Along the sides of the hull are a number of propelle; wheel boxes b which may be formed as integral portions of the hull or may be fastened thereto in any water-tight joint. Each of these boxes I), is open on its outside face and this opening is closed by a gate c, which is operated by air forced through the pipe al, to the cylinder c, where it raises the piston f which is connected to the gate c by the piston rod g. It will readily be understood that when the compressed air is turned on, it will travel through themain pipe that leads into rthe feed pipes d and all the gates c, will be practically simultaneously raised. This will allow of the shoving of the side propellers h out into the position shown by the dotted lines of Fig. 1. This is effected by a second set of cylinders i, which lie horizontally on the floor y' of the hull. The air is let into the feed pipes k through a main feed line and this forces the piston Z from the pov n o o u sition shown 1n Fig. 2, to an outward -po.

that member to rotate relatively to the piston rod m. The clutch part fn. is fast tothe shaft z and movement of the piston forces theclutch part n, into engagement with the companion clutch art which is fast to a helical gear whee o t at ordinarily runs loose upon the piston rod m. Each 'helical gear o meshes constantly with a worm gear g that is fast to one of the twin propeller shafts r, that run from the engines s te the main .propeller wheels t of the boat.

It will readily be understood ,that when the piston Z is forced out by the application of t e compressed air, the clutch will commumcate the rotation of the main propeller shaft r to the side-propeller shaft a, which carries the side propeller It. This also brings the side propeller la. out of the side of the. hull and it being rotated in the same direction as the main propeller shaft by the power from the engines, it will quickly stop the boat when the engines have been reversed. The stoppage of the boat is effected very quickly by reason of the large resistance aforded to the water all along the hull by multiplying the number of side propel- 1ers. There are six shown in the drawings` but it is obvious that any number may be used.

`When it is desirod to Withdraw the side propellers h back into their boxes, the air is sent through the feed pipes u and this will force the pistons Z inward and both withdraw the side propellers z. and also disengage the clutches p and n. The gates c are forced down to close the openings of the boxes and make the side surfaces of the hull continuous by sending air through the feed pipes w. This forces the pistons f downward and closes the propeller wheel boxes. The necessary stulling boxes are used about the piston rods to prevent seepage of the water into the interior of the boat.

What we claim is:

1. The combination with a boat, having a plurality of propeller boxes along each side, of a main propeller and shaft, a plurality of side propellers vertically disposed and ordinarilyresting in said boxes, al plurality of cylinders and pistons, one cylinpropeller, a means for furnishing compressed lluid to the pistons for forcing the propellers outward, and driving connections on the said propellers and the main propeller shaft vfor interengaging when the said propellers are forced out by the said pistons and cylinders, substantially as described.

2. 'Ilie combination with a. boat, having a propeller boX along each side, of means for driving the boat, a side propeller vertithe said apparatus thrusts the side propellers outward, substantially as described.

3. In combination with a boat provided i with a plurality of propeller boxes along its sides, a main propeller and shaft drivinof the ship, aplurality of side propellers and propeller shafts, one located in each box, a plurality of air cylinders, one for each side propeller, a piston in each air cylinder, al piston rod connected with each piston and having a connection With one side-propeller shaft, a clutch onr the side-propeller shaft, one of the parts being fast to the shaft, the other part being free to rotate thereupon, a gear wheel fast to the last mentioned clutch partand Constantly rotated bythe main propeller shaft whereby the travel of the piston connects the side-propeller With the main propeller-shaft and thrusts the sidepropellerout of the propeller-Wheel box, substantially as described.

In testimony whereof, We sign this specification in the presence of tWo Witnesses.

JOSEPH S. BLATZER. PHILIP J. PAWLOSKI.

Witnesses:

STUART C. BARNES, AMELIA C. KOEHN. 

